TAILIEUCHUNG - Visa Scheme for Inter-Organization Network Security

To specify the Outpost Network Security Client log cleanup settings on client computers, select the Log Cleanup tab. Select Delete obsolete events to preserve log size to have the Log Cleaner automatically remove outdated log entries from the database or select Keep all records to disable the Log Cleaner. Specify the age in days after which events are considered outdated, the maximum number of the most recent event records to keep in the log and the Log database size limit, a value in megabytes, that determines how large the log database should be allowed to grow. . | Visa Scheme for Inter-Organization Network Security Deborah Estrin and Gene Tsudik Computer Science Department University of Southern California Los Angeles California 90089-0782 Abstract In this paper we describe a visa scheme for implementing access control in InterOrganization Network ION gateways. The purpose of the scheme is to allow an organization to modify and trust only those internal systems that require ION access all other internal systems can not communicate with the outside. Control is distributed among the ION participants so that each may make its own design tradeoffs between performance and trust. It is đesừabỉe to implement controls at the network . packet level because of the relative performance flexibility and ubiquity of network level gateways. However a new mechanism was called for because the only information available to existing network-level gateways Is the network-level address in the packet header and such network-level addresses do not carry the higher-level logical information . organization affiliation needed to make access control decisions. lb overcome these problems a visa ION gateway works in concert with an Access Control Server ACS . The ACS carries out high-level evaluation of communication requests and the gateway enforces the ACS s decision using the visa scheme. In order for a node to send a packet through a visa gateway the node must obtain a key visa from the ACS of the visa-controlled networks that it wishes to leave and enter. If the node passes an ACS s policy filter the ACS gives its local gateway the source and destination nodes network IDs and a visa with which to authenticate packets coming from or to the source node as they pass through the gateway. The same visa Is given to the source node to stamp all outgoing packets for the duration of the session. To prevent or inhibit the acquisition of visas through interception of packets the stamp included in each packet is a function of the visa and the packet .

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